uml: Show how user can be converted to a zero-array.

To look at users I did:
$ find arch/um/ include/asm-um -name '*.[ch]'|xargs grep -r 'net_kern\.h' -l|xargs grep '\<user\>'

Most users just cast user to the appropriate pointer, the remaining ones are
fixed here. In net_kern.c, I'm almost sure that save trick is not needed
anymore, but I've not verified it.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Index: linux-2.6.git/arch/um/include/net_kern.h
===================================================================
--- linux-2.6.git.orig/arch/um/include/net_kern.h
+++ linux-2.6.git/arch/um/include/net_kern.h
@@ -40,7 +40,7 @@ struct uml_net_private {
 	void (*add_address)(unsigned char *, unsigned char *, void *);
 	void (*delete_address)(unsigned char *, unsigned char *, void *);
 	int (*set_mtu)(int mtu, void *);
-	int user[1];
+	char user[0];
 };
 
 struct net_kern_info {
Index: linux-2.6.git/arch/um/drivers/net_kern.c
===================================================================
--- linux-2.6.git.orig/arch/um/drivers/net_kern.c
+++ linux-2.6.git/arch/um/drivers/net_kern.c
@@ -331,10 +331,9 @@ static int eth_configure(int n, void *in
 	struct uml_net *device;
 	struct net_device *dev;
 	struct uml_net_private *lp;
-	int save, err, size;
+	int err, size;
 
-	size = transport->private_size + sizeof(struct uml_net_private) +
-		sizeof(((struct uml_net_private *) 0)->user);
+	size = transport->private_size + sizeof(struct uml_net_private);
 
 	device = kzalloc(sizeof(*device), GFP_KERNEL);
 	if (device == NULL) {
@@ -411,12 +410,6 @@ static int eth_configure(int n, void *in
 		return 1;
 	}
 
-	/* lp.user is the first four bytes of the transport data, which
-	 * has already been initialized.  This structure assignment will
-	 * overwrite that, so we make sure that .user gets overwritten with
-	 * what it already has.
-	 */
-	save = lp->user[0];
 	*lp = ((struct uml_net_private)
 		{ .list  		= LIST_HEAD_INIT(lp->list),
 		  .dev 			= dev,
@@ -430,8 +423,7 @@ static int eth_configure(int n, void *in
 		  .write 		= transport->kern->write,
 		  .add_address 		= transport->user->add_address,
 		  .delete_address  	= transport->user->delete_address,
-		  .set_mtu 		= transport->user->set_mtu,
-		  .user  		= { save } });
+		  .set_mtu 		= transport->user->set_mtu });
 
 	init_timer(&lp->tl);
 	spin_lock_init(&lp->lock);